<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Example_4.html</title>
</head>
<body>
    <!-- 
        题目4: 写一个函数 parseQueryString，它的用途是把 URL 参数解析为一个对象
                函数名：parseQueryString
                参数：URL字符串
                返回值：URL字符串解析后的对象
                例如：parseQueryString("admin=user&pass=1234") 返回 {admin:"user",pass:"1234"}
     -->
     第四题:<input type="text">
     <button>点击验证</button>
     <input type="text">
    
</body>
</html>
<script>
    let oInput = document.getElementsByTagName("input");
    let oBtn = document.getElementsByTagName("button");
    // console.log(oInput, oBtn)

    function parseQueryString(str) {

    }


     oBtn[0].onclick = function() {
        oInput[1].value = noRepeatArray(oInput[0].value);

    }
</script>